The main idea of the passage is to ______

The correct option is C show that experiences in the womb help shape newborn preferences and behaviour.
The passage does not mention the validity of the speech recognition tests in fetuses and, therefore, options (A) and (D) can be ruled out. Option (B) is incorrect as it is not mentioned in the passage either. The passage focuses only on a single research, carried out by a team comprising of Chinese as well as American researchers, that shows that the experiences of the fetus in the womb shape the newborn's preferences and behavior. So, the answer is option C.